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Keywords: testosterone
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Journal Articles
J Exp Biol (2020) 223 (24): jeb231613.
Published: 29 December 2020
... to cleaning services alters indicators of health status such as body condition, immunity and the steroids cortisol and testosterone in four client damselfish species Pomacentrus amboinensis , Amblyglyphidodon curacao , Acanthochromis polyacanthus and Dischistodus perspicillatus . To do so, we took...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (23): jeb232496.
Published: 15 December 2020
... avian egg is thus ‘multivariate’. Multivariate effects on offspring phenotype were evaluated in a study on captive zebra finches, by simultaneously manipulating maternally derived antibodies (MAb) by lipopolysaccharide (LPS) treatment of mothers and injection of testosterone into the egg yolk. LPS...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (11): jeb222984.
Published: 01 June 2020
... captivity, we implanted each captive bird with a 12 mm Silastic™ capsule (0.76 mm ID, 1.65 mm OD; Dow Corning, Auburn, MI) containing 10 mm crystalline testosterone. Each end (1 mm) was capped with silicone sealant, and implants were inserted subcutaneously along the nape. Testosterone implants ensured that...
Journal Articles
J Exp Biol (2018) 221 (23): jeb185504.
Published: 26 November 2018
... determined in response to subsequent injections of exogenous kisspeptin. Saline-treated controls showed a robust increase in circulating testosterone in response to kisspeptin; however, this response was blocked in LPS-treated animals. Circulating luteinizing hormone (LH) levels were elevated in response to...
Journal Articles
J Exp Biol (2018) 221 (17): jeb180869.
Published: 10 September 2018
... we measured baseline testosterone, testosterone after an acute handling stressor, and capacity to produce testosterone after hormonal stimulation. In a 2×2 design, we then killed males from the two chronic treatment groups either immediately or after an acute stressor to investigate the effect of...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (21): 4068–4077.
Published: 01 November 2017
... growing body of evidence indicates testosterone can regulate growth, thus the development of SSD, and sexual dichromatism. However, the mechanism(s) underlying these effects are conjectural, including possible conversions of testosterone to estradiol (E 2 ) or 5α-dihydrotestosterone (DHT). In the present...
Journal Articles
J Exp Biol (2017) 220 (5): 787–795.
Published: 01 March 2017
... investigated the effect of total ovariectomy, prepubertal ovariectomy, unilateral ovariectomy, and total ovariectomy followed by exogenous estradiol, dihydrotestosterone or testosterone treatment, on female growth in comparison to males and reproductively active females. The present results and the results of...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (4): 625–633.
Published: 15 February 2017
...Marco Parolini; Andrea Romano; Cristina Daniela Possenti; Manuela Caprioli; Diego Rubolini; Nicola Saino ABSTRACT Hormone-mediated maternal effects generate variation in offspring phenotype. In birds, maternal egg testosterone (T) exerts differential effects on offspring traits after hatching...
Journal Articles
J Exp Biol (2016) 219 (22): 3544–3553.
Published: 15 November 2016
.... Surprisingly, males pursuing the fixed dwarf male tactic showed the highest free and conjugated 11-KT and testosterone (T) levels. Our experimental social challenges significantly affected the free 11-KT levels of bourgeois males, but the androgen responses did not differ between challenges involving different...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (19): 3091–3099.
Published: 01 October 2016
...Willow R. Lindsay; Douglas G. Barron; Michael S. Webster; Hubert Schwabl ABSTRACT In males it is frequently testosterone (T) that activates the expression of sexually selected morphological and behavioral displays, but the role of T in regulating similar traits in females is less clear. Here, we...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (17): 2685–2693.
Published: 01 September 2015
... axis to endocrine stimulation. Here, we present data from an experiment in Abert's towhees, Melozone aberti , using gonadotropin-releasing hormone (GnRH) and luteinizing hormone (LH) challenges to investigate whether energy deficiency modulates the plasma testosterone responsiveness of the HPG axis...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (17): 2694–2704.
Published: 01 September 2015
... testosterone increased in response to photostimulation in ad libitum -fed but not in food-restricted birds. Food availability did not, however, affect the plasma testosterone increase resulting from a gonadotropin-releasing hormone-I (GnRH) or a luteinizing hormone (LH) challenge. The number of hypothalamic...
Journal Articles
J Exp Biol (2015) 218 (14): 2241–2249.
Published: 01 July 2015
... chick development, we experimentally administered three different androgen doses of the naturally occurring mixture of yolk testosterone and androstenedione to spotless starling eggs ( Sturnus unicolor ). We found that yolk androgens induce a non-linear dose–response pattern in several traits. Androgens...
Includes: Supplementary data
Journal Articles
J Exp Biol (2014) 217 (10): 1768–1774.
Published: 15 May 2014
... declare no competing financial interests. 8 7 2013 11 2 2014 © 2014. Published by The Company of Biologists Ltd 2014 Teleost Testosterone 11-ketotestosterone Cortisol Territorial aggression Interspecific behavior Animals live in competitive social environments in...
Journal Articles
J Exp Biol (2014) 217 (6): 841–849.
Published: 15 March 2014
... testosterone and free corticosterone and negatively correlated with corticosterone binding globulin capacity. These data are discussed in terms of the behavioral ecology of host and vector, and suggest that both seasonal increases in vector activity and relapse of latent (i.e. dormant) infections contribute to...
Journal Articles
J Exp Biol (2013) 216 (18): 3495–3503.
Published: 15 September 2013
... decreased it by ~4%. SD photoperiod had no effect on reproductive status and leptin levels, whereas LD males increased testes mass and serum testosterone, but the photoperiod had no effect on leptin levels. Vasopressin administration decreased LD-induced reproductive enhancement. Because no consistent...
Journal Articles
J Exp Biol (2013) 216 (1): 120–126.
Published: 01 January 2013
... single pattern built around testosterone-mediated interplay between mate choice, parasitism and predation. avyas@ntu.edu.sg 25 3 2012 12 7 2012 © 2013. Published by The Company of Biologists Ltd 2013 anti-predator behavior behavioral manipulation major urinary proteins...
Journal Articles
J Exp Biol (2012) 215 (4): 575–577.
Published: 15 February 2012
... territorial defense vs sperm production, etc.) is compromised as the expression of morph-coding genes is only visualized in one sex. Here, we circumvented this problem by first characterizing oxidative stress traits in both sexes and then using testosterone implants in females to expose their otherwise...
Journal Articles
J Exp Biol (2009) 212 (19): 3125–3131.
Published: 01 October 2009
...Mark L. Roberts; Katherine L. Buchanan; Matthew R. Evans; Raul H. Marin; Daniel G. Satterlee SUMMARY The immunocompetence handicap hypothesis (ICHH) suggests that the male sex hormone testosterone has a dual effect; it controls the development and expression of male sexually selected signals, and...
Journal Articles
J Exp Biol (2009) 212 (12): 1811–1818.
Published: 15 June 2009
...Mark Roberts; Anne Peters SUMMARY In this experiment we manipulated testosterone (T) and condition in juvenile male blue tits ( Cyanistes caeruleus ) during the moult, to test whether T's supposed immunosuppressive qualities are condition-dependent. To achieve this, we used T and control implants...